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New Evidence Shows Heat Destroys Quantum Entanglement
While devising a new quantum algorithm, four researchers accidentally established a hard limit on the “spooky” phenomenon.
To understand where quantum algorithms and the computers that can run them might offer an advantage, researchers often analyze mathematical models called spin systems, which capture the basic behavior of arrays of interacting atoms. But when Alhambra read through a preliminary draft of the four researchers’ proof, he was surprised to discover that they’d proved something else in an intermediate step: In any spin system in thermal equilibrium, entanglement vanishes completely above a certain temperature. Álvaro Alhambra, a physicist working on the same problem as Tang, Moitra, Bakshi, and Liu, realized they had accidentally proved a new result about quantum entanglement while developing their algorithm.
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